Ojs\CoreBundle\Service\DeleteService::checkUse PHP Method

    private function checkUse()
    {
        if (!count($this->checkUse)) {
            return true;
        }
        foreach ($this->checkUse as $usage) {
            $findRelations = $this->findRelations($usage);
            if (count($findRelations) > 0) {
                $relationStrings = [];
                foreach ($findRelations as $relation) {
                    $relationRefl = new \ReflectionClass($relation);
                    $relationStrings[] = (string) $relation . '[' . $relationRefl->getShortName() . '-' . $usage['field'] . '#' . $relation->getId() . ']';
                }
                $hasRelationException = new HasRelationException();
                $hasRelationException->setErrorMessage($this->translator->trans('deletion.remove_components_first', ['%field%' => "\n - " . implode("\n - ", $relationStrings)]));
                throw $hasRelationException;
            }
        }
        return true;
    }